<?php
class Page {
    public $firstRow; // 起始行数
    public $listRows; // 列表每页显示行数
    public $parameter; // 分页跳转时要带的参数
    public $totalRows; // 总行数
    public $totalPages; // 分页总页面数
    public $rollPage = 11; // 分页栏每页显示的页数

    private $p       = 'page'; //分页参数名
    private $url     = ''; //当前链接URL
    private $nowPage = 1;

    // 分页显示定制
    private $config = array(
        'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>',
        'prev'   => '<<',
        'next'   => '>>',
        'first'  => '1...',
        'last'   => '...%TOTAL_PAGE%',
        'theme'  => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%',
    );

    /**
     * 架构函数
     * @param array $totalRows  总的记录数
     * @param array $listRows  每页显示记录数
     * @param array $parameter  分页跳转的参数
     */
    public function __construct($totalRows, $listRows = 20, $parameter = array())
    {
        C('VAR_PAGE') && $this->p = C('VAR_PAGE'); //设置分页参数名称（注：当一个页面同时有多个分页模块时可以定义不同的C('VAR_PAGE')值用于区分）
        /* 基础设置 */
        $this->totalRows = $totalRows; //设置总记录数
        $this->listRows  = $listRows; //设置每页显示行数
        $this->parameter = $parameter;//zhao
        $this->nowPage   = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]);
        $this->nowPage   = $this->nowPage > 0 ? $this->nowPage : 1;
        $this->firstRow  = $this->listRows * ($this->nowPage - 1);
    }

    /**
     * 定制分页链接设置
     * @param string $name  设置名称
     * @param string $value 设置值
     */
    public function setConfig($name, $value)
    {
        if (isset($this->config[$name])) {
            $this->config[$name] = $value;
        }
    }

    /**
     * 生成链接URL
     * @param  integer $page 页码
     * @return string
     */
    private function url($page)
    {
        return str_replace(urlencode('[PAGE]'), $page, $this->url);
    }

    /**
     * 组装分页链接
     * @return string
     */
    public function show()
    {
        if (0 == $this->totalRows) {
            return '';
        }

        /* 生成URL */
        $this->parameter[$this->p] = '[PAGE]';
        $this->url                 = Router::decodeUrl('', $this->parameter);//zhao
        /* 计算分页信息 */
        $this->totalPages = ceil($this->totalRows / $this->listRows); //总页数
        if (!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
            $this->nowPage = $this->totalPages;
        }

        /* 计算分页临时变量 */
        $now_cool_page      = $this->rollPage / 2;
        $now_cool_page_ceil = ceil($now_cool_page);

        //上一页
        $up_row  = $this->nowPage - 1;
        $up_page = $up_row > 0 ? '<a class="prev" href="' . $this->url($up_row) . '">' . $this->config['prev'] . '</a>' : '';

        //下一页
        $down_row  = $this->nowPage + 1;
        $down_page = ($down_row <= $this->totalPages) ? '<a class="next" href="' . $this->url($down_row) . '">' . $this->config['next'] . '</a>' : '';

        //第一页
        $the_first = '';
        if ($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1) {
            $the_first = '<a class="first" href="' . $this->url(1) . '">' . $this->config['first'] . '</a>';
        }

        //最后一页
        $the_end = '';
        if ($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages) {
            $the_end = '<a class="end" href="' . $this->url($this->totalPages) . '">' . $this->config['last'] . '</a>';
        }

        //数字连接
        $link_page = "";
        for ($i = 1; $i <= $this->rollPage; $i++) {
            if (($this->nowPage - $now_cool_page) <= 0) {
                $page = $i;
            } elseif (($this->nowPage + $now_cool_page - 1) >= $this->totalPages) {
                $page = $this->totalPages - $this->rollPage + $i;
            } else {
                $page = $this->nowPage - $now_cool_page_ceil + $i;
            }
            if ($page > 0 && $page != $this->nowPage) {

                if ($page <= $this->totalPages) {
                    $link_page .= '<a class="num" href="' . $this->url($page) . '">' . $page . '</a>';
                } else {
                    break;
                }
            } else {
                if ($page > 0 && 1 != $this->totalPages) {
                    $link_page .= '<span class="current">' . $page . '</span>';
                }
            }
        }

        //pagesize 设置每页面显示条数
        $pagesize = "<li class='page_pagesize_div' style='color:#666;margin-left:5px;display: inline;'>
        每页
        <div class='btn-group dropup' style='width:45px;'>
        <a class='btn dropdown-toggle' style='padding:4px 7px;color:#666 !important;' data-toggle='dropup' href='#'>{$this->listRows}<span class='caret'></span></a>
        <ul class='dropdown-menu' style='min-width:45px;width:45px;display:none;'>
        <li><a class='ajaxSubmit refresh' link='index.php?app=functions&act=setPageSize&pagesize=200'>200</a></li>
        <li><a class='ajaxSubmit refresh' link='index.php?app=functions&act=setPageSize&pagesize=100'>100</a></li>
        <li><a class='ajaxSubmit refresh' link='index.php?app=functions&act=setPageSize&pagesize=50'>50</a></li>
        <li><a class='ajaxSubmit refresh' link='index.php?app=functions&act=setPageSize&pagesize=20'>20</a></li>
        <li><a class='ajaxSubmit refresh' link='index.php?app=functions&act=setPageSize&pagesize=10'>10</a></li>
        </ul>
        </div>
        条
        <style>
        .page_pagesize_div ul li a{display:block;border:0 none;border-radius:0 !important;width:100%;padding:0;}
        .pager .page_pagesize_div .caret{font-size:14px;float: none;padding: 0;border-right: 4px solid transparent;border-left: 4px solid transparent;}
        </style>
        <script>
        $('.page_pagesize_div .dropdown-menu a').click(function(){ $('.page_pagesize_div .dropdown-menu').hide(); });//点击选择选项时,隐藏div
        $(document).click(function(){ $('.page_pagesize_div .dropdown-menu').hide(); });
        $('.page_pagesize_div .dropdown-toggle').toggle(function(){ page_page_div_show_hide(); },function(){ page_page_div_show_hide(); });//toggle显示/隐藏
        function page_page_div_show_hide(){
        if($('.page_pagesize_div .dropdown-menu').css('display')=='none') $('.page_pagesize_div .dropdown-menu').show(); else $('.page_pagesize_div .dropdown-menu').hide();
        }
        </script>
        </li>";
        
        //替换分页内容
        $page_str = str_replace(
            array('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%','%PAGESIZE%'),
            array($this->config['header'], $this->nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages,$pagesize),
            $this->config['theme']);
        $page_str = Router::encodeUrls($page_str);//zhao encode加密url
        return "<div>{$page_str}</div>";
    }
}
